If anyone here is a patreon to Evakiss, could you hit her up that the open-relationship content with Eva is still innacessible?
The issue is the following:
The opportunity to get an open relationship with Eva happens in label v26c and requires that Eva be Ash's girlfriend (evagf) and that Eva be addicted to bbc (evabbc), so its "if evagf and evabbc".
The only opportunity to turn evabbc on is during Tyrone's poolparty, which happens in label v18 and its derivatives.
However, between those 2 labels, in label v20dateeva, the game runs a check if Eva wants to break up with Ash, the criteria the game uses is that Eva will break up with Ash if either Eva is addicted to bbc or if Eva has low love score with Ash, so the check looks like this "if evabbc or evalove < 3". If Eva breaks up with Ash, the game turns off "evagf" and turns on "evasexfriend" and you can never turn evagf back on again.
So quite simply, if the player never turns evabbc on they don't have the option of getting a "liberal" relationship with Eva, but if they turn evabbc on they will lose Eva as a girlfriend no matter what.
One could argue this is deprecated code and that Evakiss ditched the idea of having an open relationship with Eva in the game, instead replacing it with the "evasexfriend" stuff for casual sex but not being together. But there is quite a bit of endgame content that requires the impossible state of being in a liberal relationship with Eva, it is not impossible that Evakiss had already written this endgame content before ditching an open-relationship with Eva from the game, but it would be nice to get confirmation one way or another.
If it is a matter of patching it I'd say the simplest patch that wouldn't break shit would be to replace the "if evabbc or evalove < 3" check with something like "if evalove < 3 or evabbc and evalove < 5". This should make all the possible content be available and still plays in the idea that the bbc temptation is messing with Eva, but it is just that if she loves Ash enough she won't want to break up with Ash which eventually leads into the open-relationship stuff.